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Two-dimensional full particle simulation of the flow patterns in the scrape-off-layer plasma for upper- and lower-null point divertor configurations in tokamaks

Takizuka, Tomonori; Shimizu, Katsuhiro; Hayashi, Nobuhiko; Hosokawa, Masanari*; Yagi, Masatoshi*

Plasma flow in the SOL plays an important role for the particle control in magnetic fusion reactors. To study SOL flow patterns, we perform simulations with a full particle code, PARASOL. For upper-null divertor configuration with ion $$nabla$$${it B}$ drift away from the null point, the flow is directed to inner and outer plates. The stagnation point is located symmetrically at the bottom. On the other hand for lower-null case with ion $$nabla$$${it B}$ drift toward the null point, the flow in outer SOL region has a backward flow pattern. The stagnation point moves below the mid-plane of outer SOL. These simulation results are very similar to experiment. Simulations are carried out by changing the aspect ratio $$A$$ and by artificially cutting the electric field. It is found that the banana motion of trapped ions is important for the formation of flow pattern in addition to the self-consistent electric field. Trapped-ion effects can be stronger than electric-field effects for standard tokamaks with $$A$$ $$<$$ 5.

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Category:Physics, Fluids & Plasmas

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